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Old 04-11-2011, 11:42 AM   #3
Brokinarrow


 
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Drives: 2012 Honda NC700x
Join Date: Sep 2008
Location: Indianola, IA
Posts: 5,317
I've seen this posted on here before I believe, but yes, very cool contraption! Basically, if I remember right, there is a sort of self sealing valve in the bottom of the cups.
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